@article{GDZPPN002034042, title = {Tactical decompositions of designs.}, journal = {Aequationes mathematicae}, volume = {25}, year = {1982}, pages = {123-152}, zbl = {0521.05012}, url = {http://dml.mathdoc.fr/item/GDZPPN002034042} }
Beker, H.; Mitchell, Ch.; Piper, F. Tactical decompositions of designs.. Aequationes mathematicae, Tome 25 (1982) pp. 123-152. http://gdmltest.u-ga.fr/item/GDZPPN002034042/